Yeah, it comes across as fairly bitter. Then again, it's hardly the only place I've seen that sentiment. The net is full of "game designers" and "industry insiders" with a take on fifth edition, and more often than not, that take boils down to "It's doomed to failure because they didn't hire me to design it."
Ninety-nine percent of it is pure speculation. I admit that I'm not overly sanguine about 5e's chances of success, but I'm willing to wait and judge the system once I've actually seen it.